Gravity Data Decomposition Based on Spectral Analysis and Halo Wavelet Transform, Case Study at Birdâs Head Peninsula, West Papua

Gravity imagery is commonly used in the preliminary study of sedimentary basins. Gravity data have an excellent lateral resolution but poor vertical resolution. The gravity response represents the superposition of all elements of differing density contrasts and depthsfor a given region below the surface. The ability to perform depth-based gravity data decomposition is important for the interpretation of the data. This can be achieved by combiningspectral analysis withthe Halo wavelet transform. The decomposition method was tested using synthetic data as well as field data collected at Bird's Head Peninsula, West Papua. Examination of the proposed method using the synthetic data produced satisfactory results that corresponded well to the models. The test using the field data clearly imaged anticline structures that formed due tothe ongoing collision of the Australia Continental Plate and the Pacific Oceanic Plate. In part of the Lengguru Fold and Thrust Belt, the folding structures are not imaged at depths greater than ~6 km. We proposethat folding structures are not found at deeper levels. The gravity imagery also indicates that the Sorong Fault Zonebreaks apart into several segments, which causes other perpendicular lineaments(strike-slip faulting). These strike-slip faults are clearly visible in the Bird's Head Region

Why CCS? Milestone on Research and Regulation Coverages

Further to Kyoto Protocol, again in 2009 G-20 Pittsburg Summit, Indonesia delivered the commitment on reducing 26% on its emission level. Moreover, as non-annex 1 country, Indonesia shows strong and bold commitment in supporting reduction on increased concentrations of greenhouse gases produced by human activities such as burning the fossil fuels and deforestation. From the energy sector, Carbon Capture and Storage (CCS) is known as a process of capturing waste carbon dioxide (CO2) from large point sources and depositing it normally at an underground geological formation. CCS becomes now as one of the possible supports to the country commitment. In Indonesia, the potential of CCS applications could be conducted in the gas fields with high content of CO2 and in almost depleted oil fields (by applying CO2-Enchanced Oil Recovery (EOR) The CCS approach could also be conducted in order to increase hydrocarbon production, and at the same time the produced CO2 will be injected and storage it back to the earth. Thus, CCS is a mitigation process in enhancing carbon emission reduction caused by green house effect from production hydrocarbon fields.This paper will show a proposed milestone on CCS Research roadmap, as steps to be taken in reaching the objective. The milestone consists of the study for identifying potential CO2 sources, evaluating CO2 storage sites, detail study related to CO2 storage selection, CO2 injection, and CO2 injection monitoring. Through these five steps, one can expect to be able to comprehend road map of CCS Research. Through this research milestone, applications of CCS should also be conducted based on the regulatory coverage milestone. From this paper, it is hoped that one can understand the upstream activities starting with research milestone to the very end downstream activities regarding to the regulation coverage bound. Keywords: CCS, reduction of carbon emission, regulation umbrella

Pendeteksian Batas-batas Zona Steamflood Menggunakan Data Anomali Gayaberat-mikro 4d Yang Diberi Konstrain

Recently, the oil industry has emphasized enhancement oil recovery (EOR) process. The steamflood are ones EOR process can used to increase the heavy oil production. Effective management of EOR process requires detailed reservoir description and observation of the reservoir being swept at time. The 4D microgravity method can be applied in obtaining reservoir description such as steamflood zone mapping. Combination between the rock physics analysis with ideal model of steamflood used to calculate the synthetic 4D microgravity anomaly. This result suggest the negative 4D microgravity anomaly changes at time represented steamflood zones causes by density contras between steam at the high temperature after injection and pressure with heavy oil at the low temperature and pressure before injection. But the 4D microgravity anomaly can't detect steamflood zone boundaries causes the anomaly shape with respect to shape of source. We proposed the 4D microgravity anomaly constrained with high resolution horizontal derivative to detect steamflood zones boundaries. The field data showed gravity change of up to -300mGal have occurred in area near ones the oil production well. The maxima value of the field constrained 4D microgravity anomaly represented the steamflood zones boundaries with its surrounding